docs: update AGENTS.md to reflect recent changes

[RedStar071]

🔗 Linked issue

N/A — routine AGENTS.md maintenance.

🧭 Context

This is the weekly automated review of AGENTS.md against pull requests merged into main in the last 7 days.

📚 Description

Reviewed all PRs merged into main between 2026-08-10 and 2026-08-17 (#25–#42). Most were dependency/CI bumps with no doc impact (renovate preset switch, GitHub Actions version bumps, a subcommand-registry log-noise fix). Two were checked closely because they touch things AGENTS.md documents directly:

• feat: migrate to changesets v3 #41 (feat: migrate to changesets v3) already updated AGENTS.md itself as part of that PR (node engines range, changesets v3 notes), so no gap there.
• fix(deps): update all non-major dependencies #26 (fix(deps): update all non-major dependencies) bumped the pinned pnpm version via packageManager in package.json from 11.17.0 to 11.21.0, but AGENTS.md's toolchain notes still cited 11.17.0.

Key changes

Aspect	Before	After
Documented pnpm version (Toolchain notes)	11.17.0	11.21.0 (matches current package.json packageManager)

Type of Change

• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation change
• Workflow / CI change

Pre-flight Checklist

• I have read the Contributing Guidelines (if applicable)
• My code follows the code style of this project
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have updated the documentation accordingly
• I added a changeset with pnpm changeset (or pnpm changeset add --empty if no release is needed) — not needed, this is a docs-only change to a file outside packages/, matching the precedent set by docs: update AGENTS.md to reflect recent changes #31.

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Note

Update pinned pnpm version in AGENTS.md from 11.17.0 to 11.21.0

Updates the corepack-pinned pnpm version in AGENTS.md to match the current toolchain.

^{Macroscope summarized 4967165.}